STMicroelectronics 2STC5242

Overview

2STC5242 from STMicroelectronics is a high-power NPN epitaxial planar bipolar transistor using BiT-LA technology for linear amplifier applications, featuring V_CEO = 230 V, I_C = 15 A, P_tot = 150 W at T_C = 25°C, f_T = 30 MHz, and R_thJ-case = 0.83°C/W - deployed in audio power amplifier output stages.

For engineers reviewing the 2STC5242 datasheet, 2STC5242 pinout, 2STC5242 application, or 2STC5242 equivalent, key selection criteria include safe operating area (SOA) compliance at high V_CE, low saturation voltage under high-current drive (V_CE(sat) = 3 V @ I_C = 8 A), gain linearity at audio frequencies, and TO-3P thermal performance for Class AB amplifier heatsink integration.

Technical Context

This device implements a monolithic NPN bipolar junction transistor optimized for linear operation, with high breakdown voltage enabling rail-to-rail swing in push-pull audio output stages. Its BiT-LA process ensures stable h_FE across collector current (35–160 @ I_C = 1–7 A) and low distortion due to gain linearity.

Designed for resistive-load switching with t_on = 0.24 µs, t_s = 4.7 µs, and t_f = 0.6 µs at V_CC = 60 V, it supports fast transient response while maintaining SOA integrity up to 150°C junction temperature and 150 W dissipation.

Key Specifications

Pinout & Package

Supplied in TO-3P package: insulated metal tab, 3-pin through-hole configuration with collector connected to case for direct heatsink mounting and low-inductance thermal path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power NPN linear amplifier applications.

Compared with 2SC5200, 2STC5242 offers identical electrical and thermal specs but differs in BiT-LA process optimization for gain linearity; versus MJE15030, it delivers 50% higher power handling and 50% faster f_T, making it essential for high-fidelity, high-output audio stages.

Availability

2STC5242 is available at Aetrix Electronics and suitable for Hi-Fi audio amplifier output stages, professional PA system drivers, and studio monitor power modules requiring stable component supply and long-term industrial availability.

Supply support for 2STC5242 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for automotive, industrial, and consumer markets.

The 2STC5242 belongs to ST's high-power bipolar transistor family engineered specifically for linear audio amplification, emphasizing SOA robustness, gain linearity, and thermal reliability in demanding analog signal chains.

FAQ

Is the 2STC5242 RoHS-compliant and lead-free?

Yes. The 2STC5242 is manufactured in ST's ECOPACK®-compliant TO-3P package with lead-free second-level interconnect, meeting JEDEC JESD97 standards. The inner box label indicates the lead-free category, and soldering profiles follow ST's published thermal guidelines for Pb-free reflow.

What is the safe operating area (SOA) limit at 100°C case temperature?

At T_C = 100°C, the maximum continuous collector current drops to approximately 10.5 A at V_CE = 100 V, derived from the derating curve (Figure 3) and R_thJ-case = 0.83°C/W. Full 15 A operation requires T_C ≤ 40°C for 150 W dissipation.

Can the 2STC5242 be used in parallel configurations?

Yes, but requires emitter degeneration resistors (typically 0.1–0.22 Ω) to ensure current sharing. The BiT-LA process provides tight h_FE distribution, and matching V_BE vs. I_C curves (Figure 7) support stable parallel operation when mounted on a common heatsink with identical thermal paths.

Does the 2STC5242 require a minimum base drive current for linear operation?

For linear Class AB operation at 7 A collector current, a base drive of ≥700 mA is required (h_FE min = 10). Base current must be sourced from a low-impedance driver stage capable of sustaining ≥1 V V_BE swing (typical V_BE = 1.5 V @ I_C = 7 A), as specified in Table 4.